Add missing devDependencies

Author: cheton

package.json

@@ -60,6 +60,7 @@
     "eslint-plugin-react": "^4.3.0",
     "nib": "^1.1.0",
     "style-loader": "^0.13.1",
+    "stylint": "^1.3.8",
     "stylus": "^0.54.2",
     "stylus-loader": "^2.0.0",
     "tap": "^5.7.0",